JP2002074689A - Recording and reproducing device and photographic device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording and reproducing device which is capable of rapidly carrying out recording and reproducing in the next turning on of a power source and inserting of a disk by previously moving an optical head to an inner peripheral side in turning off of the power source or taking out of the disk. SOLUTION: This device has the optical head recording and/or reproducing arbitrary data by irradiating the optical disk with a laser, a driving means for driving the optical head in the radial direction of the optical disk and a sensor for detecting that the optical head exists on the innermost periphery. The driving means drives the optical head to the inner peripheral side when the power source of the device is turned off or the disk is taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head position control technique for an optical disc apparatus, and more particularly to a head position control technique for an optical disc apparatus used for recording in a camera or the like.

[0002]

2. Description of the Related Art In recent years, optical disks have been increasing in capacity,
A recording / reproducing apparatus, such as a DVD-RAM, which records and reproduces data exceeding several gigabytes, has appeared.

In such an optical disk, there are a user area in which a user can record and reproduce arbitrary data, and a disk management information area on the inner periphery of the disk. The disk management information area has information on the type of the disk and defect management information. Is recorded.

[0004] Information in the management information area is data unique to each disc, and in order for a user to perform arbitrary data recording / reproduction on this disc, it is necessary to first read them.

Therefore, when a new disk is inserted or when the power is turned on, the optical head is moved to the disk management information area on the inner circumference of the disk, and after reading the information of the disk, the data is transferred to the user area of the disk. Recording and playback.

[0006]

However, when the power is turned on or a disc is inserted, a series of processing is required before the user can record and reproduce data on the disc, and until the user can perform recording and reproduction. Means that it takes a considerable amount of time.

[0007] Further, after data is recorded / reproduced in the user area, when the power is turned off or the disc is taken out, the optical head is located at a place to access an arbitrary user area.
Therefore, the next time you turn on the power or insert a disc,
In order to read out the management information of the disk, it takes time to move the optical head to the management information recording area of the disk. In particular, when the optical head is located farthest from the management information recording area of the disc, it takes time in seconds to move the optical head to the management information recording area. However, due to the increase in the capacity of the optical disk, it is conceivable that the optical disk device is used for a video recording / reproducing device such as a video camera or an electronic still camera. In such a case, it is desirable to record video data in the user area immediately after the user issues a shooting request, but it takes time to start recording in the user area when power is turned on or a disc is inserted. This is very problematic because a momentary photo opportunity may be missed. In this case, a method of storing recording data in a large-capacity buffer memory until the optical disk device can start recording can be considered, but an increase in cost is inevitable.

When the optical head is moved at a high speed, the driving noise increases. Therefore, the speed cannot be increased when recording audio, and the start of recording in the user area is further delayed.

Therefore, it is desirable that the time from when the power is turned on or when the disk is inserted to when the user data can be recorded / reproduced be as short as possible, and that the driving noise of the optical head be small.

In view of the above, an object of the present invention is to move the optical head in advance to the vicinity of the management information recording area of the disk when the power is turned off or the disk is taken out.
It is an object of the present invention to provide a recording and / or reproducing apparatus capable of performing recording and reproduction quickly when the power is turned on or when a disc is inserted.

[0011]

A first means of the present invention is as follows.
A recording or / and reproducing apparatus comprising: an optical head for irradiating a laser beam on an optical disk to record or / reproduce arbitrary data; and a driving unit for driving the optical head in a radial direction of the optical disk. The recording and / or reproducing apparatus is characterized in that when the power is turned off, the driving means moves the optical head to a predetermined position and then turns off the power of the apparatus.

A second means of the present invention comprises an optical head for irradiating a laser beam to a removable optical disk from the apparatus to record or / reproduce arbitrary data, and driving the optical head in a radial direction of the optical disk. Recording / reproducing apparatus comprising: a recording or / reproducing apparatus comprising: a drive unit for moving the optical head to a predetermined position when removing the optical disk from the apparatus; And / or a playback device. According to a third aspect of the present invention, in the recording and / or reproducing apparatus according to the first and second aspects, the predetermined position is a management information recording area of the optical disc. is there.

According to a fourth aspect of the present invention, an imaging screen is formed on an imaging surface of a solid-state imaging device via a predetermined optical system, the imaging screen is converted into a video signal, and the video signal is transferred to an optical disk. In a photographing apparatus provided with a recording device for recording, the recording device is a recording device of first, second, and third means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the recording / reproducing apparatus of the present invention. 101 is a disk as a recording medium, 102 is an optical head unit, 103 is an optical head unit driving motor, 104 is a driving screw, 105 is an inner SW that detects that the optical head unit is at the innermost circumference, and 106 is a disk. A spindle motor for rotating; 107, control means for controlling the entire apparatus; 108, a motor driver for driving the optical head drive motor; 109, a motor driver for driving the spindle motor; 110, a recording / reproducing means for recording / reproducing data; Is a memory, 112 is a power supply of the apparatus, 113 is a means for ejecting a disk, 114 is a lens,
115 is a solid-state image sensor, 116 is signal processing means, 117
Is a buffer memory, and 118 is a microphone. FIG. 2 is a diagram showing a management information area and a user data area of the disk 101. 201 is a management information area, and 202 is a user data area.

In FIG. 1, a disk 101 is a large-capacity optical disk, and has a management information area (201 in FIG. 2) on an inner peripheral portion thereof. When the power is turned on or the disk is inserted, the control means 107 controls the motor driver 10
The spindle motor is driven via 9 to rotate the disk. Further, the control unit 107 drives the optical head unit driving motor 103 via the motor driver 108. A drive screw 104 having a thread groove is attached to the optical head section drive motor 103, and the optical head section 102 is moved to the inner periphery of the disk along the thread groove. When the optical head unit 102 reaches the innermost circumference, the inner circumference SW 105
Is turned on and sent to the control circuit 107. If the rotation of the spindle is stabilized after the optical head unit 102 reaches the innermost circumference, the control unit 107 instructs the recording / reproducing unit 110 to read out the management information of the disk. The recording / reproducing unit 110 reads out the management information area 201 via the optical head unit 102 and outputs it to the memory 111. After performing the above operations, recording and reproduction of user data can be performed.

On the other hand, when the user gives a shooting instruction,
The light incident from the lens 114 is converted into an electric signal by the solid-state imaging device 115, and is converted into image data by the signal processing unit 1.
16 is input. In some cases, audio data is input to the signal processing unit 116 from the microphone 118.

The signal processing means 116 performs necessary signal processing (for example, MPEG compression processing), and the video and audio data are stored in the buffer memory 117. When the user data can be recorded, the control unit 107 sets the optical head unit 102 to an arbitrary user data area (202 in FIG. 2).
The video and audio data stored in the buffer memory 117 are transferred to the recording / reproducing unit 110 and the optical head unit 1.
02 on a disc. At this time, the capacity of the buffer memory 117 only needs to have a capacity corresponding to the time when the minimum user data can be recorded.

Next, the operation when the power is turned off or the disc is removed will be described. When recording / reproducing to / from the user data area is performed, the optical head unit 102 is located in an arbitrary user data area. At this time, in the related art, when the power is turned off or the disc is removed, the position of the optical head unit 102 does not change, and when the power is turned on or the disc is inserted again, the optical head unit 102 is moved to the position of the management information area 201. Time is needed.

If the moving time of the optical head unit 102 is long, the capacity of the buffer memory 117 must be increased.

Further, when the optical head is moved at high speed to reduce the time, the driving sound increases, and a problem arises in that the driving sound is recorded via the microphone 108 during voice recording.

In the present invention, the following control is performed to solve this problem.

When transitioning to the power-off state, the control means 1
Reference numeral 07 drives the optical head unit driving motor 103 via the motor driver 108 to move the optical head unit 102 to the inner periphery. When the optical head unit 102 reaches the innermost circumference, the inner circumference SW 105 is turned on. After that, the control unit 107 turns off the power supply 112. At this time, the optical head unit 102 is located in the vicinity of the management information area 201, and the information in the management information area 201 can be quickly read when the power is turned on next time.

In the above example, the power is turned off after the optical head 102 reaches the innermost circumference.
The power supply may be turned off before 2 reaches the innermost circumference. However, in this case, the optical head unit 102 does not reach the innermost circumference, but is located on the inner circumference side, that is, on the management information area 201 side, compared to the initial state.

Also, when taking out the disk, the control means 107 drives the optical head driving motor 103 via the motor driver 108 to move the optical head 102 to the inner periphery. When the optical head unit 102 reaches the innermost circumference, the inner circumference SW 105 is turned on, and thereafter, the disc is ejected by the disc ejection means 113. At this time, the optical head unit 102 is located in the vicinity of the management information area 201, and the information in the management information area 201 can be quickly read when the disc is inserted next time.

Also in this case, after the disc ejection operation, the optical head unit 102 may be moved to the inner periphery, or the disc ejection and the inner periphery movement of the optical head unit 102 may be operated in parallel. After the optical head unit 102 is moved to the inner circumference, the disc ejection operation may be performed.

In the above example, a switch is used as the detecting means for detecting that the optical head unit 102 is located at the innermost periphery. Instead of the switch, an optical sensor such as a photo interrupter, a potentiometer, or a switch is used. Open-loop position control by a stepping motor may be used.

In the above example, the management information area is located at the innermost periphery of the disk. However, even when the management information area is located at the outermost periphery of the disk or at any other position, the same applies when the power is turned off or the disk is removed. Needless to say, the optical head unit 102 may be moved to the vicinity of the management information area 201 first.

As described above, the next time the power is turned on or the disc is inserted, the optical head unit 102 is located on the inner peripheral side in advance, so that the management information is read out quickly and the time required for recording and reproducing user data is reduced. Can be done. Further, the capacity of the buffer memory 117 can be relatively small. Further, it is not necessary to drive the optical head 102 at a high speed, and the problem of recording a driving sound during voice recording can be solved.

[0029]

According to the present invention, when the power is turned off or the disk is taken out, the optical head is moved inward in advance so that the recording and reproduction can be performed quickly at the next power-on or when the disk is inserted. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a recording / reproducing apparatus of the present invention.

FIG. 2 is a schematic diagram illustrating a management information area and a user data area of a recording medium.

[Explanation of symbols]

101: disk, 102: optical head section, 103: optical head section drive motor, 104: drive screw, 105 ...
Inner circumference SW, 106: spindle motor, 107: control means, 108: motor driver, 109: motor driver, 110: recording / reproducing means, 111: memory, 112 ...
Power supply, 113 ... discharge means of the disk, 114 ... lens,
115: solid-state imaging device, 116: signal processing means, 117
.., Buffer memory, 118, microphone, 201, management information area, 202, user data area.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Akifumi Mibe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Digital Media Development Division of Hitachi, Ltd. 5D059 LA07 LA08 5D068 AA02 BB01 CC03 EE11 EE13 GG01 5D117 AA02 CC04

Claims (4)

[Claims] 1. A recording / reproducing apparatus comprising: an optical head for irradiating a laser beam on an optical disc to record / reproduce arbitrary data; and a driving unit for driving the optical head in a radial direction of the optical disc. 5. The recording and / or reproducing apparatus according to claim 1, wherein when the power of the apparatus is turned off, the driving unit moves the optical head to a predetermined position and then turns off the power of the apparatus. 2. An optical head for recording and / or reproducing arbitrary data by irradiating a laser to an optical disk which is detachable from the apparatus, and a driving means for driving the optical head in a radial direction of the optical disk. A recording / reproducing apparatus according to claim 1, wherein the drive unit moves the optical head to a predetermined position when removing the optical disk from the apparatus. 3. The recording according to claim 1 and / or 2,
In the recording and / or reproducing apparatus, the predetermined position is a management information recording area of the optical disc. 4. A recording device for forming an imaging screen on an imaging surface of a solid-state imaging device via a predetermined optical system, converting the imaging screen into a video signal, and recording the video signal on an optical disc. 4. The photographing device according to claim 1, wherein the recording device is the recording device according to claim 1. 5.